The interface supports the following Display Types:
MAIN SHIP SEA STATE MOTIONS
ACCELERATIONS STRENGTH WARNINGS
The topmost part of the screen will have a similar layout regardless of selected Display type. This section of the windows is called the Header Section. Besides the Display type, this section presents the name of the ship, time and date and one or two more items:
Link Status:
Indicates whether this window is linked to a Voyage or not.
Warnings:
Indicates whether the Warnings Active-box in linked Warnings window is checked or not.
The following pages describes the different displays. In the figures, certain areas are framed and numbered. This is done for easier identification while reading the appendix.
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NOTE: This Display type is available only during Monitor-mode.
Ship Section, 1
Output from bridge instruments.
Sea State Section, 2
Output copied from the Sea State window of Ship Set. The wave direction is presented as relative to the ship, SB(+)/PS(-) 0-180 deg, where 0 deg is head waves.
Wind Section, 3
Output from bridge instruments. The wind direction is presented as relative to the ship, SB(+)/PS(-) 0-180 deg, where 0 deg is head wind.
Warnings Section, 4
Summary of warnings. The warnings are activated if one or more warnings in the generic displays are activated.
Advice Section, 5
The graph is initially blank. By pressing the Advice... button, the user may select any predicted response included in active Voyage or active Ship Set. The magnitude of the selected response will be presented in the graph as function of ship speed and heading. The Clear Advice button will empty the graph.
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Ship Input Section, 1 Input mode:
The user may select Fixed Displacement or Fixed Floatation mode. The input set as well as the output set from the hydrostatic calculations will change to reflect the selection made, see the figures.
Input items:
Fixed Displacement mode, input:
Displacement: Displacement in metric tons
Long. CG: Longitudinal CG, Positive fwd Lpp/2 Transv. CG: Transverse CG, Positive to PS from CL Vert CG: Vertical CG, Positive upwards from keel Correction GM: Correction for free surfaces
Fixed Floatation mode, input:
Draught: Draught at Lpp/2
Trim: Total trim, Positive trim by the aft Heel: Static heel angle, Positive to SB
Vert CG: Vertical CG, Positive upwards from keel Correction GM: Correction for free surfaces.
Dynamic Strength Input Section, 2
This section is activated if a Voyage including the active Ship Set and a Strength window is defined.
Weight distribution:
To perform predictions of vertical bending moment, the weight distribution type must be selected prior to calculations of hydrodynamic properties. The user may select Full Load or Ballast type distribution.
Calculated Ship Properties:
The results from hydrodynamic calculations are indicated by two flags. The second flag tells whether weight distribution was selected prior to calculations or not.
Hydrostatic output items:
Fixed Displacement mode, output:
For Draught, Trim and Heel, see Fixed Floatation mode, input.
GM: Metacentric height.
GM': Metacentric height, corrected for free surfaces.
GZ: Righting lever at different heel angles.
Fixed Floatation mode, output:
For Displacement, Long. CG and Transv. CG,
see Fixed Displacement mode, input.
For GM, GM' and GZ, see Fixed Displacement mode, output.
Warnings Section, 4
A threshold value may be assigned to the GM' output. The warning will be activated if the hydrostatic calculations result in to low GM'.
Sea State Display
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During Set Up-mode, only Manual Operating mode is available. The input to the Sea State Section must be supplied by the user.
During Monitor-mode, Auto or Interrupt Operating modes are available. If Auto mode is selected, no input is required or possible. The user may override the default wave characteristics (long-crested sea) and wave direction (equals wind direction) if Interrupt is selected. To use manual wave direction, the Use manual input box must be checked. On return to Auto mode, the user input will be used during evaluation of the sea state.
Sea State Section, 2
Input or output depending on software mode, see Operating Mode Section.
Wave characteristics:
If Interrupt is selected, the user may override the default (long-crested sea) characteristics. On return to Auto operating mode, the user selection will be used.
Ship speed:
Read from bridge instruments or user input depending on operating mode.
Wave direction:
Read from bridge instruments or user input depending on operating mode. The wave direction is given as relative to the ship, SB(+)/PS(-) 0-180 deg, where 0 deg is head waves.
Wave period:
Calculated value or user input depending on operating mode.
Wave height, significant:
Calculated value or user input depending on operating mode.
Wave height, expected maximum during 1 hour:
Output during Monitor mode.
Warnings Section, 3
A threshold value may be assigned to the output of expected maximum wave height during 1 hour. The warning will be activated if the sea state evaluation result in a to high value.
Motions Display
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Sea State Info Section, 1
Indicates the type of sea state (Manual or Auto) used for the presented predictions. If Auto sea state, the time period for measurements is shown.
Predicted Motions Section, 2 Rigid body motions:
For heave, pitch, roll, sway and yaw the predicted responses are presented as significant values and expected maximum values during 1 hour, single amplitude.
If a limit value is supplied (Warnings Display), the probable number of events for the calculated maximum response to exceed the limit value during 1 hour will be calculated.
Relative motions:
The relative motions Bow slamming and Green water on deck are presented as the probable no of events during 1 hour. No limit values are required.
Warnings Section, 3
Threshold values may be assigned to the predicted output (Warnings Display). A warning will be activated if the calculated probable number of events for the maximum response to exceed the limit value during 1 hour is higher than the threshold value.
Accelerations Display
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Sea State Info Section, 1
Indicates the type of sea state (Manual or Auto) used for the presented predictions. If Auto sea state, the time period for measurements is shown.
Points Input section, 2
The Acceleration windows require user input of point coordinates to work. Two points may be defined. The points will be used for predictions of accelerations as well as effective heel angles.
Point #:
Input point name. Not required.
Long:
Point longitudinal coordinate. Measured from AP, positive fwd.
Transv:
Point transverse coordinate. Measured from CL, positive at PS.
Vert:
Point vertical coordinate. Measured from keel, positive upwards.
Predicted Accelerations Section, 3 Accelerations:
For valid points, predicted as significant values and expected maximum values during 1 hour, single amplitude.
If a limit value is supplied (Warnings Display), the probable number of events for the calculated maximum response to exceed the limit value during 1 hour will be calculated.
Effective heel angles:
If valid points are assigned limit values (Warnings Display), the predicted total time for the effective heel angles to exceed the limit values during 1 hour are presented.
Warnings Section, 4
Threshold values may be assigned to the predicted output (Warnings Display). A warning will be activated if the calculated probable number of events, or predicted total time, for the maximum response to exceed the limit value during 1 hour is higher than the threshold value.
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Sea State Info Section, 1
Indicates the type of sea state (Manual or Auto) used for the presented predictions. If Auto sea state, the time period for measurements is shown.
Predicted Dynamic Loads Section, 2 Ship Weight distribution:
Indicates the type of weight distribution used for the predictions.
Largest wave induced Vertical Bending Moment:
For the highest loaded section, predicted vertical bending moment is presented as significant value and expected maximum value during 1 hour, single amplitude. If a limit value is supplied (Warnings Display), the probable number of events for the calculated maximum response to exceed the limit value during 1 hour will be calculated. The section number of the highest loaded section is presented.
Longitudinal distribution VBM:
The predicted significant values are presented at 10 sections along the hull.
Warnings Section, 3
A threshold value may be assigned to the predicted output of largest vertical bending moment at section (Warnings Display). The warning will be activated if the calculated probable number of events for the maximum response to exceed the limit value during 1 hour is higher than the threshold value.
NOTE: The Warnings windows have 2 pages. Use the Page buttons at the bottom to toggle between pages.
Input Section
The input section has separate parts for each display type. The user is not required to supply input to all input fields, only those of interest.
Warnings Active boxes:
Use or Do not use the supplied input. The status of this check boxes are shown in the headers, Warnings item, in other windows.
Limit values Input:
For most items it is possible to input a limit value. If a limit value is supplied, the probable number of events for the calculated maximum response to exceed the limit value during 1 hour will be calculated.
Warnings Threshold values Input:
A threshold value may be assigned to all items. If it is possible to input a limit value for the same response component, it is of no use only supplying the threshold value. The warning will be activated if the calculated probable number of events for the maximum response to exceed the limit value during 1 hour is higher than the threshold value.
In those cases limit values are not possible, the warnings will be activated when the calculated output is higher than the threshold (for GM' lower).
These examples will guide you through the MONITOR interface.
To start the application, double-click on the MONITOR icon or select the icon and execute Open from the File menu.
The application will always start up in Set up-mode and open one empty Ship Set, i.e. one window each of the types Main, Ship, Sea State and Motions.
The first thing to do is to initialise, i.e. prepare for predictions. This may be done in either of two ways, by opening an earlier saved Ship Set or Voyage that includes a Ship Set, or by doing it from the very beginning.
The first example describes both alternatives.
Set Up mode, Initialisation, (manual operation)
1) Start the application according to the above instructions.
2) Try the Display and Windows menus. You are probably in the Ship display at the moment. Try to select the Sea State and Motions displays from the Display menu. Pull down the Windows menu. Note that the names of the windows are Ship Set 1 in all these displays.
Try to move to the Accelerations display. The screen becomes all white, which means that there are no open windows of type Accelerations. If you pull down the Windows menu it will be empty.
3) Return to the Ship display (select Ship from the Display menu). Locate the Input Mode buttons in the top left corner. Examine the two alternative options, and select one of them.
Fill in the blue input fields to the left. If you try to pull down the calculate menu before you have supplied all the values, you will not be able to execute any calculations. Do not execute any calculations yet.
4) Now save the window. Select Save or Save As... from the File menu. A dialog will open that lets you specify the name you want for the file, and select a folder or place on the hard disk to put it.
5) Select Close All from the File menu. This command closes all open windows regardless of their type. Only those linked to open Voyages will remain open, but we do not use any Voyage at the moment. If you move around to the different Display types, you will only see blank pages.
6) Return to the Ship display. Select Open from the File menu. A dialog will open. Try to find the file you just saved, select it and click open. You will now see your saved Ship Set, but this time it is named as the file.
7) Pull down the Calculate menu. If all input values are supplied, you will be able to execute All Hydro Properties or Hydrostatic. Select All Hydro Properties.
This command executes both the hydrostatic and the hydrodynamic calculations.
You will have to wait a few minutes for the calculations to finish. When complete, the initialisation is ready.
8) Now try Save again. This time you save the ship set including the output. The next time you open it, the Ship Set will be ready for predictions.
9) Move to the Sea State display. You now have the choice of continue operating in manual mode (Set Up) or selecting Monitor mode. This is done from the Monitor menu.
10) Let's stay in Set Up-mode for a while. The Sea State windows accept input during this mode. Try to input some figures and pull down the Calculate menu.
If all input fields are filled, you will be able to execute All responses. Do so.
11) Select the Motions display. You should now have some results ready. The output fields for Predicted number of events... will be blank. To get results in these fields, you have to supply limit values, and this is done from the Warnings display.
12) Move to the Warnings display. Select New from the File menu to get a new, empty window. Locate the Motions part on page one. Fill in some of the Limit value fields and check the Warnings Active box. Return to the Motions display and note that nothing has happened here. This is because the Warnings windows, as also the Accelerations and Strength windows, must be included by the use of a Voyage.
13) Select New Voyage from the File menu. The Voyage menu will be enabled.
Pull down the menu, and you will see all open Voyages at the bottom. The one you are working with is checked.
14) The next step is to link your Warnings window and Ship set to this Voyage.
Move to the Warnings display. Select Link File from the Voyage menu. The Link Status indicator in the top right corner will state Linked.
15) Now move to the Ship display. When you want to link a ship set, this must be done from here. Select Link File from the Voyage menu. All the windows in the ship set will now indicate that they are linked.
16) Move to the Motions display. The Warnings indicator in the top right corner reflects the status of the Warnings Active check box in the linked Warnings window. If you did input some limit values earlier, the predicted results are cleared.
17) Pull down the Calculate menu and execute Motions. The command All responses only works from the Sea State display. When the predictions are made, you will see the number of expected events... for those motion components you have given limit values.
18) To have the Warnings work, you must supply the Warnings threshold values in addition to the limit values. Move to the Warnings display.
19) Input threshold values for all motion components. Then return to the Motions display. The warnings for those components you have given both limit and threshold values should work now, they are either blue or red.
20) If you return to the Warnings display and uncheck the Warnings Active box, the input set given will not be used. Move to the Motions display. The Warnings indicator in the top right corner will state Not active.
21) Now select Save Voyage from the File menu. You will see an alert telling that all windows linked to the Voyage you are trying to save must be saved first.
Click OK.
22) As the ship set is already saved, it requires no additional saving. But the Warnings window has to be saved. Give it a name and save it, and then save the Voyage.
23) Now select Close Voyage from the File menu. This command closes the Voyage and all its linked windows. You should not have any open windows by now.
24) Select Open Voyage. Try to find the name of the Voyage you just saved and click open. When you open a voyage, all the linked windows will be opened with it, so this action will bring you the ship set as well as the Warnings window back.
25) You have now tried most of the basic functions of the MONITOR interface in manual mode. The Accelerations and Strength windows work just like the Warnings windows, they have to be linked to function.
If you want predictions of vertical bending moment (Strength display), you have to create your Voyage and include the Strength window and Ship set, and select the preferred weight distribution type in the Ship display before you execute the hydrodynamic calculations.
26) Select Quit from the File menu. This terminates the application.
Monitor mode (auto operation)
1) Start the MONITOR application and open the Voyage you have prepared. You may execute Close All from the File menu to close all windows that does not belong to the Voyage.
2) Move to the Sea State display. Pull down the Monitor menu (this menu can only be handled from here) and select Monitor. The program now reads the files on the hard disk of the computer administrating the measurements of ship motions. It then tries to evaluate the sea state based on these measurements.
3) When the sea state is calculated, all predictions you have included in your Voyage will be performed. Right now this means that Motions will be predicted based on the evaluated sea state.
4) When in Auto mode, you have to judge the validity of the sea state suggested by the program. If you are in the Sea State display, take a look at the assumed wave direction. If the value is bad compared to the actual direction, the calculated sea state will probably be poor.
5) You may use manual input for the wave direction. Select Interrupt in the top left corner. This will allow you to input a manual value in the wave direction field. Check the Use manual input box to the right of the input field.
6) You may also change wave characteristics by checking the appropriate box.
7) If you switch to Auto again, the program will use your manual input and recalculate the sea state. The result should improve if the first assumptions were poor.
8) You may at any time switch to manual (Set Up) mode. It is possible to input a manual sea state and make manual predictions in parallel to the automatic predictions made in Monitor mode. All output windows have two separate sets of data, i.e. one for manual sea state and one for auto sea state.
9) While in Monitor (Auto) mode, the Main display is available. Select it from the Display menu. The Main display presents a summary of the information given in
9) While in Monitor (Auto) mode, the Main display is available. Select it from the Display menu. The Main display presents a summary of the information given in